This simulation allows vector addition, in a graphical way, in 2-D
Courtesy of PHET, University of Colorado Boulder
Static Equilibrium for a Plate with Support at Three Points from the Wolfram Demonstrations Project by Frederick Wu
A table with 3 legs. When will it tip over?
Courtesy of the Wolfram Demonstrations Project
(Trouble? Download and install the Wolfram CDF player here. We use it a lot, and it does some really cool stuff.